Compasses.



No. 755,395. PATENTED MAR. 22, 1904. G. SGHOBNNER. GOMPASSES.

APPLICATION FILED NOV. 7, 1903.

N0 MODEL.

Patented March 22, 1904.

UNITED STATES PATENT OEETCE.

GEORG SOHOENNER, OF NUREMBERG, GERMANY.

CONIPASSES.

SPECIFICATION forming part of Letters Patent No. 755,395, dated March 22, 1904. Application led November 7, 1903. Serial No. 180,256. (No model.)

To all whom it may Concern:

Be it known that I, GEORG SCHOENNER, manufacturer, a subject of the Emperor of Germany, and a resident of Nuremberg, in the Empire of Germany, (whose post-oilice address is 7 Gartenstrasse, Nuremberg aforesaid,) have invented Certain new and useful Improvements in Compasses, of which the following is a specilication.

rIhis invention has for its object a pair or' Compasses having an insertion-piece, in which Compasses, by means of a very simple improved arrangement, not only is the insertion held fast and its adjustment as regards direction,'(or rather its security against displacement,) but also a line adjustment of the width of the Compasses is obtained. In order to obtain these advantages, there is arranged on the inner side of the leg of thei Compasses, which leg serves for receiving the insertionpiece, a spring-tongue, (a strip spring held fast at one end,) which closes the aperture for the insertion of the piece in the compass-leg.

In the accompanying drawings, Figure l is an elevation oi' a pair of Compasses fitted with this improved arrangement, and Eig. 2 a similar view or' a modiication; while Fig. 3 is a vertical section and partial elevation, on an enlarged scale, of the insertion-piece; and Fig. 4, a detail view.

A pin provided in the ordinary manner on an insertion-piece a, is beveled olf at the side, which when the insertion is in use faces the middle of the Compasses. The Compassleg c has at its lower end a recess CZ, openingy downward and toward the middle of the Compasses, in which recess d a strip-spring e, forming a tongue, lies entirely or partially Countersunk and is held at one side by means of a small screw f. After the insertion-pin 6 has been introduced into the insertion-aperture remaining behind the springtongue e the tongue e in Consequence of its elasticity bears against the beveled Vside of the Vpin b, so that the insertion is retained in its position and direction by being clamped and secured against being turned without its being necessary to provide a separate pressure or Clamp screw for this object. On the outside of the Compass-leg a pressure-screw g is arranged and serves exclusively for effecting the fine adjustment of the Compasses. If, in fact, the rough adjustment of the Compasses has taken place in the ordinary manner and the screw g be screwed in the direction toward the middle of the Compasses, it presses the insertionpin o against the spring-tongue e, whereby the free end of the latter is bent toward the middle of the Compasses. As the upper end of the insertion-pin remains at its original place, (see Fig. 2,) the entire insertion turns a little on this point. It is thus possible to obtain any desired ne adjustment of the Compasses.

I declare that what I Claim is- 1. A pair of Compasses having one of the legs thereof provided with a groove or elongated aperture in its inner face extending to the end of said leg, an insertion-piece adapted to fit said leg, and a spring Closing the entire open side of said opening and bearing against the side of the insertion-piece and a set-screw eX- tending through the opposite wall of saidA leg for swinging the insertion-piece against the tension of the spring substantially as described.

Q. In a pair of Compasses an insertion-piece such as described, a spring e bearing against one side of the insertion-piece, a screw g arranged opposite the spring e on the leg c of the Compasses and adapted to move said insertion-piece c toward the middle of the compasses against the resistance of the spring e, and in this manner to operate a ine adjustment of the width or' the Compasses, substantially as set forth.

In witness whereof I have hereunto set my hand in presence of two witnesses.

GEORG SOHOENNER. Vlfitnesses:

LEONHARD KOERBEE, HERMANN DHLEMANN. 

